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Related Experiment Videos

A noninvasive estimation of hypernasality using a linear predictive model.

D K Rah1, Y L Ko, C Lee

  • 1Department of Plastic Surgery, College of Medicine, Yonsei University, Seoul, Korea.

Annals of Biomedical Engineering
|August 15, 2001
PubMed
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A new method estimates hypernasality using only a microphone and computer. This cost-effective approach offers a less invasive way to assess speech disorders caused by soft palate defects.

Area of Science:

  • Speech-Language Pathology
  • Acoustic Analysis
  • Biomedical Engineering

Background:

  • Hypernasality, characterized by abnormal speech resonance, often results from soft palate defects.
  • Current clinical assessments for hypernasality are often invasive or require costly instrumentation.
  • Accurate quantification of hypernasality is crucial for evaluating surgical outcomes.

Purpose of the Study:

  • To introduce a novel, quantitative method for estimating hypernasality.
  • To develop a cost-effective and less invasive alternative to existing assessment tools.
  • To correlate the proposed method's results with established hypernasality measures.

Main Methods:

  • Utilizing a microphone and personal computer with a sound card to capture digitized speech data.

Related Experiment Videos

  • Leveraging the inaccuracy of linear predictive models in vocal tract systems with frequency response zeros, a hallmark of hypernasality.
  • Comparing sequences of linear predictive cepstrum from low- and high-order models to quantify hypernasality.

    • Main Results:

    • The proposed method demonstrated a stronger correlation (0.58) with nasometer-measured nasalance compared to the Teager method (0.44).
    • For data with nasalance exceeding 35%, the proposed method achieved a higher correlation (0.84) than the Teager method (0.71).
    • The technique relies solely on digitized speech, indicating reduced invasiveness.

    Conclusions:

    • The proposed method offers a simple, cost-effective, and less invasive means of evaluating hypernasality.
    • This approach provides a valuable tool for speech-language pathologists and researchers.
    • Further validation may lead to widespread clinical adoption for assessing speech resonance disorders.